blob: 563d1967a0ad9dedea75893570757cc765125b19 [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
2 * Advanced Linux Sound Architecture
Jaroslav Kyselac1017a42007-10-15 09:50:19 +02003 * Copyright (c) by Jaroslav Kysela <perex@perex.cz>
Linus Torvalds1da177e2005-04-16 15:20:36 -07004 *
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
10 *
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
15 *
16 * You should have received a copy of the GNU General Public License
17 * along with this program; if not, write to the Free Software
18 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
19 *
20 */
21
Linus Torvalds1da177e2005-04-16 15:20:36 -070022#include <linux/init.h>
23#include <linux/slab.h>
Jonathan Corbet78a3c3d2008-05-15 16:39:03 -060024#include <linux/smp_lock.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070025#include <linux/time.h>
Takashi Iwai9a1a2a12005-11-22 15:46:41 +010026#include <linux/device.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070027#include <linux/moduleparam.h>
28#include <sound/core.h>
29#include <sound/minors.h>
30#include <sound/info.h>
31#include <sound/version.h>
32#include <sound/control.h>
33#include <sound/initval.h>
34#include <linux/kmod.h>
Ingo Molnar1a60d4c2006-01-16 16:29:08 +010035#include <linux/mutex.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070036
Linus Torvalds1da177e2005-04-16 15:20:36 -070037static int major = CONFIG_SND_MAJOR;
38int snd_major;
Takashi Iwaic0d3fb32006-04-28 15:13:39 +020039EXPORT_SYMBOL(snd_major);
40
Linus Torvalds1da177e2005-04-16 15:20:36 -070041static int cards_limit = 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -070042
Jaroslav Kyselac1017a42007-10-15 09:50:19 +020043MODULE_AUTHOR("Jaroslav Kysela <perex@perex.cz>");
Linus Torvalds1da177e2005-04-16 15:20:36 -070044MODULE_DESCRIPTION("Advanced Linux Sound Architecture driver for soundcards.");
45MODULE_LICENSE("GPL");
46module_param(major, int, 0444);
47MODULE_PARM_DESC(major, "Major # for sound driver.");
48module_param(cards_limit, int, 0444);
49MODULE_PARM_DESC(cards_limit, "Count of auto-loadable soundcards.");
Linus Torvalds1da177e2005-04-16 15:20:36 -070050MODULE_ALIAS_CHARDEV_MAJOR(CONFIG_SND_MAJOR);
51
52/* this one holds the actual max. card number currently available.
53 * as default, it's identical with cards_limit option. when more
54 * modules are loaded manually, this limit number increases, too.
55 */
56int snd_ecards_limit;
Takashi Iwaic0d3fb32006-04-28 15:13:39 +020057EXPORT_SYMBOL(snd_ecards_limit);
Linus Torvalds1da177e2005-04-16 15:20:36 -070058
Clemens Ladisch6983b722005-11-20 14:05:49 +010059static struct snd_minor *snd_minors[SNDRV_OS_MINORS];
Ingo Molnar1a60d4c2006-01-16 16:29:08 +010060static DEFINE_MUTEX(sound_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -070061
Johannes Bergee2da992008-07-09 10:28:41 +020062#ifdef CONFIG_MODULES
Linus Torvalds1da177e2005-04-16 15:20:36 -070063
64/**
65 * snd_request_card - try to load the card module
66 * @card: the card number
67 *
68 * Tries to load the module "snd-card-X" for the given card number
Johannes Bergee2da992008-07-09 10:28:41 +020069 * via request_module. Returns immediately if already loaded.
Linus Torvalds1da177e2005-04-16 15:20:36 -070070 */
71void snd_request_card(int card)
72{
Takashi Iwai746df942006-05-15 19:49:05 +020073 if (snd_card_locked(card))
Linus Torvalds1da177e2005-04-16 15:20:36 -070074 return;
75 if (card < 0 || card >= cards_limit)
76 return;
77 request_module("snd-card-%i", card);
78}
79
Takashi Iwaic0d3fb32006-04-28 15:13:39 +020080EXPORT_SYMBOL(snd_request_card);
81
Linus Torvalds1da177e2005-04-16 15:20:36 -070082static void snd_request_other(int minor)
83{
84 char *str;
85
Linus Torvalds1da177e2005-04-16 15:20:36 -070086 switch (minor) {
87 case SNDRV_MINOR_SEQUENCER: str = "snd-seq"; break;
88 case SNDRV_MINOR_TIMER: str = "snd-timer"; break;
89 default: return;
90 }
91 request_module(str);
92}
93
Johannes Bergee2da992008-07-09 10:28:41 +020094#endif /* modular kernel */
Linus Torvalds1da177e2005-04-16 15:20:36 -070095
Clemens Ladischf87135f2005-11-20 14:06:59 +010096/**
97 * snd_lookup_minor_data - get user data of a registered device
98 * @minor: the minor number
99 * @type: device type (SNDRV_DEVICE_TYPE_XXX)
100 *
101 * Checks that a minor device with the specified type is registered, and returns
102 * its user data pointer.
103 */
104void *snd_lookup_minor_data(unsigned int minor, int type)
105{
106 struct snd_minor *mreg;
107 void *private_data;
108
Adrian Bunk3a63e4442006-03-13 14:14:10 +0100109 if (minor >= ARRAY_SIZE(snd_minors))
Clemens Ladischf87135f2005-11-20 14:06:59 +0100110 return NULL;
Ingo Molnar1a60d4c2006-01-16 16:29:08 +0100111 mutex_lock(&sound_mutex);
Clemens Ladischf87135f2005-11-20 14:06:59 +0100112 mreg = snd_minors[minor];
113 if (mreg && mreg->type == type)
114 private_data = mreg->private_data;
115 else
116 private_data = NULL;
Ingo Molnar1a60d4c2006-01-16 16:29:08 +0100117 mutex_unlock(&sound_mutex);
Clemens Ladischf87135f2005-11-20 14:06:59 +0100118 return private_data;
119}
120
Takashi Iwaic0d3fb32006-04-28 15:13:39 +0200121EXPORT_SYMBOL(snd_lookup_minor_data);
122
Jonathan Corbet78a3c3d2008-05-15 16:39:03 -0600123static int __snd_open(struct inode *inode, struct file *file)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700124{
Clemens Ladisch332682b2005-11-20 14:07:47 +0100125 unsigned int minor = iminor(inode);
Takashi Iwai512bbd62005-11-17 13:51:18 +0100126 struct snd_minor *mptr = NULL;
Arjan van de Ven99ac48f2006-03-28 01:56:41 -0800127 const struct file_operations *old_fops;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700128 int err = 0;
129
Adrian Bunk3a63e4442006-03-13 14:14:10 +0100130 if (minor >= ARRAY_SIZE(snd_minors))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700131 return -ENODEV;
Clemens Ladisch332682b2005-11-20 14:07:47 +0100132 mptr = snd_minors[minor];
133 if (mptr == NULL) {
Johannes Bergee2da992008-07-09 10:28:41 +0200134#ifdef CONFIG_MODULES
Clemens Ladisch332682b2005-11-20 14:07:47 +0100135 int dev = SNDRV_MINOR_DEVICE(minor);
136 if (dev == SNDRV_MINOR_CONTROL) {
137 /* /dev/aloadC? */
138 int card = SNDRV_MINOR_CARD(minor);
139 if (snd_cards[card] == NULL)
140 snd_request_card(card);
141 } else if (dev == SNDRV_MINOR_GLOBAL) {
142 /* /dev/aloadSEQ */
143 snd_request_other(minor);
144 }
145#ifndef CONFIG_SND_DYNAMIC_MINORS
146 /* /dev/snd/{controlC?,seq} */
147 mptr = snd_minors[minor];
148 if (mptr == NULL)
149#endif
150#endif
151 return -ENODEV;
152 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700153 old_fops = file->f_op;
154 file->f_op = fops_get(mptr->f_ops);
Laurent Pinchartf41ced82009-01-06 14:40:40 -0800155 if (file->f_op == NULL) {
156 file->f_op = old_fops;
157 return -ENODEV;
158 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700159 if (file->f_op->open)
160 err = file->f_op->open(inode, file);
161 if (err) {
162 fops_put(file->f_op);
163 file->f_op = fops_get(old_fops);
164 }
165 fops_put(old_fops);
166 return err;
167}
168
Jonathan Corbet78a3c3d2008-05-15 16:39:03 -0600169
170/* BKL pushdown: nasty #ifdef avoidance wrapper */
171static int snd_open(struct inode *inode, struct file *file)
172{
173 int ret;
174
175 lock_kernel();
176 ret = __snd_open(inode, file);
177 unlock_kernel();
178 return ret;
179}
180
Arjan van de Ven9c2e08c2007-02-12 00:55:37 -0800181static const struct file_operations snd_fops =
Linus Torvalds1da177e2005-04-16 15:20:36 -0700182{
183 .owner = THIS_MODULE,
184 .open = snd_open
185};
186
Clemens Ladisch332682b2005-11-20 14:07:47 +0100187#ifdef CONFIG_SND_DYNAMIC_MINORS
188static int snd_find_free_minor(void)
189{
190 int minor;
191
192 for (minor = 0; minor < ARRAY_SIZE(snd_minors); ++minor) {
193 /* skip minors still used statically for autoloading devices */
194 if (SNDRV_MINOR_DEVICE(minor) == SNDRV_MINOR_CONTROL ||
195 minor == SNDRV_MINOR_SEQUENCER)
196 continue;
197 if (!snd_minors[minor])
198 return minor;
199 }
200 return -EBUSY;
201}
202#else
Takashi Iwai512bbd62005-11-17 13:51:18 +0100203static int snd_kernel_minor(int type, struct snd_card *card, int dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700204{
205 int minor;
206
207 switch (type) {
208 case SNDRV_DEVICE_TYPE_SEQUENCER:
209 case SNDRV_DEVICE_TYPE_TIMER:
210 minor = type;
211 break;
212 case SNDRV_DEVICE_TYPE_CONTROL:
Takashi Iwai7eaa9432008-08-08 17:09:09 +0200213 if (snd_BUG_ON(!card))
214 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700215 minor = SNDRV_MINOR(card->number, type);
216 break;
217 case SNDRV_DEVICE_TYPE_HWDEP:
218 case SNDRV_DEVICE_TYPE_RAWMIDI:
219 case SNDRV_DEVICE_TYPE_PCM_PLAYBACK:
220 case SNDRV_DEVICE_TYPE_PCM_CAPTURE:
Takashi Iwai7eaa9432008-08-08 17:09:09 +0200221 if (snd_BUG_ON(!card))
222 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700223 minor = SNDRV_MINOR(card->number, type + dev);
224 break;
225 default:
226 return -EINVAL;
227 }
Takashi Iwai7eaa9432008-08-08 17:09:09 +0200228 if (snd_BUG_ON(minor < 0 || minor >= SNDRV_OS_MINORS))
229 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700230 return minor;
231}
Clemens Ladisch332682b2005-11-20 14:07:47 +0100232#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700233
234/**
Johannes Berg12b131c2006-10-05 15:05:34 +0200235 * snd_register_device_for_dev - Register the ALSA device file for the card
Linus Torvalds1da177e2005-04-16 15:20:36 -0700236 * @type: the device type, SNDRV_DEVICE_TYPE_XXX
237 * @card: the card instance
238 * @dev: the device index
Clemens Ladisch2af677f2005-11-20 14:03:48 +0100239 * @f_ops: the file operations
Clemens Ladischf87135f2005-11-20 14:06:59 +0100240 * @private_data: user pointer for f_ops->open()
Linus Torvalds1da177e2005-04-16 15:20:36 -0700241 * @name: the device file name
Johannes Berg12b131c2006-10-05 15:05:34 +0200242 * @device: the &struct device to link this new device to
Linus Torvalds1da177e2005-04-16 15:20:36 -0700243 *
244 * Registers an ALSA device file for the given card.
245 * The operators have to be set in reg parameter.
246 *
Johannes Berg12b131c2006-10-05 15:05:34 +0200247 * Returns zero if successful, or a negative error code on failure.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700248 */
Johannes Berg12b131c2006-10-05 15:05:34 +0200249int snd_register_device_for_dev(int type, struct snd_card *card, int dev,
250 const struct file_operations *f_ops,
251 void *private_data,
252 const char *name, struct device *device)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700253{
Clemens Ladisch332682b2005-11-20 14:07:47 +0100254 int minor;
Takashi Iwai512bbd62005-11-17 13:51:18 +0100255 struct snd_minor *preg;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700256
Takashi Iwai7eaa9432008-08-08 17:09:09 +0200257 if (snd_BUG_ON(!name))
258 return -EINVAL;
Clemens Ladisch562b5902006-07-05 11:24:22 +0200259 preg = kmalloc(sizeof *preg, GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700260 if (preg == NULL)
261 return -ENOMEM;
Clemens Ladisch2af677f2005-11-20 14:03:48 +0100262 preg->type = type;
Clemens Ladisch6983b722005-11-20 14:05:49 +0100263 preg->card = card ? card->number : -1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700264 preg->device = dev;
Clemens Ladisch2af677f2005-11-20 14:03:48 +0100265 preg->f_ops = f_ops;
Clemens Ladischf87135f2005-11-20 14:06:59 +0100266 preg->private_data = private_data;
Ingo Molnar1a60d4c2006-01-16 16:29:08 +0100267 mutex_lock(&sound_mutex);
Clemens Ladisch332682b2005-11-20 14:07:47 +0100268#ifdef CONFIG_SND_DYNAMIC_MINORS
269 minor = snd_find_free_minor();
270#else
271 minor = snd_kernel_minor(type, card, dev);
272 if (minor >= 0 && snd_minors[minor])
273 minor = -EBUSY;
274#endif
275 if (minor < 0) {
Ingo Molnar1a60d4c2006-01-16 16:29:08 +0100276 mutex_unlock(&sound_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700277 kfree(preg);
Clemens Ladisch332682b2005-11-20 14:07:47 +0100278 return minor;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700279 }
Clemens Ladisch6983b722005-11-20 14:05:49 +0100280 snd_minors[minor] = preg;
Greg Kroah-Hartmanabe9ab82008-07-21 20:03:34 -0700281 preg->dev = device_create(sound_class, device, MKDEV(major, minor),
282 private_data, "%s", name);
Mariusz Kozlowski24690492007-10-09 10:34:06 +0200283 if (IS_ERR(preg->dev)) {
284 snd_minors[minor] = NULL;
285 mutex_unlock(&sound_mutex);
286 minor = PTR_ERR(preg->dev);
287 kfree(preg);
288 return minor;
289 }
290
Ingo Molnar1a60d4c2006-01-16 16:29:08 +0100291 mutex_unlock(&sound_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700292 return 0;
293}
294
Johannes Berg12b131c2006-10-05 15:05:34 +0200295EXPORT_SYMBOL(snd_register_device_for_dev);
Takashi Iwaic0d3fb32006-04-28 15:13:39 +0200296
Takashi Iwai9d19f482006-09-06 14:27:46 +0200297/* find the matching minor record
298 * return the index of snd_minor, or -1 if not found
299 */
300static int find_snd_minor(int type, struct snd_card *card, int dev)
301{
302 int cardnum, minor;
303 struct snd_minor *mptr;
304
305 cardnum = card ? card->number : -1;
306 for (minor = 0; minor < ARRAY_SIZE(snd_minors); ++minor)
307 if ((mptr = snd_minors[minor]) != NULL &&
308 mptr->type == type &&
309 mptr->card == cardnum &&
310 mptr->device == dev)
311 return minor;
312 return -1;
313}
314
Linus Torvalds1da177e2005-04-16 15:20:36 -0700315/**
316 * snd_unregister_device - unregister the device on the given card
317 * @type: the device type, SNDRV_DEVICE_TYPE_XXX
318 * @card: the card instance
319 * @dev: the device index
320 *
321 * Unregisters the device file already registered via
322 * snd_register_device().
323 *
324 * Returns zero if sucecessful, or a negative error code on failure
325 */
Takashi Iwai512bbd62005-11-17 13:51:18 +0100326int snd_unregister_device(int type, struct snd_card *card, int dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700327{
Takashi Iwai9d19f482006-09-06 14:27:46 +0200328 int minor;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700329
Ingo Molnar1a60d4c2006-01-16 16:29:08 +0100330 mutex_lock(&sound_mutex);
Takashi Iwai9d19f482006-09-06 14:27:46 +0200331 minor = find_snd_minor(type, card, dev);
332 if (minor < 0) {
Ingo Molnar1a60d4c2006-01-16 16:29:08 +0100333 mutex_unlock(&sound_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700334 return -EINVAL;
335 }
336
Greg Kroah-Hartmand80f19f2006-08-07 22:19:37 -0700337 device_destroy(sound_class, MKDEV(major, minor));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700338
Takashi Iwai9d19f482006-09-06 14:27:46 +0200339 kfree(snd_minors[minor]);
Clemens Ladisch6983b722005-11-20 14:05:49 +0100340 snd_minors[minor] = NULL;
Ingo Molnar1a60d4c2006-01-16 16:29:08 +0100341 mutex_unlock(&sound_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700342 return 0;
343}
344
Takashi Iwaic0d3fb32006-04-28 15:13:39 +0200345EXPORT_SYMBOL(snd_unregister_device);
346
Takashi Iwai9d19f482006-09-06 14:27:46 +0200347int snd_add_device_sysfs_file(int type, struct snd_card *card, int dev,
Greg Kroah-Hartmand80f19f2006-08-07 22:19:37 -0700348 struct device_attribute *attr)
Takashi Iwai9d19f482006-09-06 14:27:46 +0200349{
350 int minor, ret = -EINVAL;
Greg Kroah-Hartmand80f19f2006-08-07 22:19:37 -0700351 struct device *d;
Takashi Iwai9d19f482006-09-06 14:27:46 +0200352
353 mutex_lock(&sound_mutex);
354 minor = find_snd_minor(type, card, dev);
Greg Kroah-Hartmand80f19f2006-08-07 22:19:37 -0700355 if (minor >= 0 && (d = snd_minors[minor]->dev) != NULL)
356 ret = device_create_file(d, attr);
Takashi Iwai9d19f482006-09-06 14:27:46 +0200357 mutex_unlock(&sound_mutex);
358 return ret;
359
360}
361
362EXPORT_SYMBOL(snd_add_device_sysfs_file);
363
Takashi Iwaie28563c2005-12-01 10:42:42 +0100364#ifdef CONFIG_PROC_FS
Linus Torvalds1da177e2005-04-16 15:20:36 -0700365/*
366 * INFO PART
367 */
368
Takashi Iwai6581f4e2006-05-17 17:14:51 +0200369static struct snd_info_entry *snd_minor_info_entry;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700370
Clemens Ladisch2af677f2005-11-20 14:03:48 +0100371static const char *snd_device_type_name(int type)
372{
373 switch (type) {
374 case SNDRV_DEVICE_TYPE_CONTROL:
375 return "control";
376 case SNDRV_DEVICE_TYPE_HWDEP:
377 return "hardware dependent";
378 case SNDRV_DEVICE_TYPE_RAWMIDI:
379 return "raw midi";
380 case SNDRV_DEVICE_TYPE_PCM_PLAYBACK:
381 return "digital audio playback";
382 case SNDRV_DEVICE_TYPE_PCM_CAPTURE:
383 return "digital audio capture";
384 case SNDRV_DEVICE_TYPE_SEQUENCER:
385 return "sequencer";
386 case SNDRV_DEVICE_TYPE_TIMER:
387 return "timer";
388 default:
389 return "?";
390 }
391}
392
Takashi Iwai512bbd62005-11-17 13:51:18 +0100393static void snd_minor_info_read(struct snd_info_entry *entry, struct snd_info_buffer *buffer)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700394{
Clemens Ladisch6983b722005-11-20 14:05:49 +0100395 int minor;
Takashi Iwai512bbd62005-11-17 13:51:18 +0100396 struct snd_minor *mptr;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700397
Ingo Molnar1a60d4c2006-01-16 16:29:08 +0100398 mutex_lock(&sound_mutex);
Clemens Ladisch6983b722005-11-20 14:05:49 +0100399 for (minor = 0; minor < SNDRV_OS_MINORS; ++minor) {
400 if (!(mptr = snd_minors[minor]))
401 continue;
402 if (mptr->card >= 0) {
403 if (mptr->device >= 0)
Clemens Ladischd0015442005-11-20 14:09:05 +0100404 snd_iprintf(buffer, "%3i: [%2i-%2i]: %s\n",
Clemens Ladisch6983b722005-11-20 14:05:49 +0100405 minor, mptr->card, mptr->device,
406 snd_device_type_name(mptr->type));
407 else
Clemens Ladischd0015442005-11-20 14:09:05 +0100408 snd_iprintf(buffer, "%3i: [%2i] : %s\n",
Clemens Ladisch6983b722005-11-20 14:05:49 +0100409 minor, mptr->card,
410 snd_device_type_name(mptr->type));
411 } else
Clemens Ladischd0015442005-11-20 14:09:05 +0100412 snd_iprintf(buffer, "%3i: : %s\n", minor,
Clemens Ladisch6983b722005-11-20 14:05:49 +0100413 snd_device_type_name(mptr->type));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700414 }
Ingo Molnar1a60d4c2006-01-16 16:29:08 +0100415 mutex_unlock(&sound_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700416}
417
418int __init snd_minor_info_init(void)
419{
Takashi Iwai512bbd62005-11-17 13:51:18 +0100420 struct snd_info_entry *entry;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700421
422 entry = snd_info_create_module_entry(THIS_MODULE, "devices", NULL);
423 if (entry) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700424 entry->c.text.read = snd_minor_info_read;
425 if (snd_info_register(entry) < 0) {
426 snd_info_free_entry(entry);
427 entry = NULL;
428 }
429 }
430 snd_minor_info_entry = entry;
431 return 0;
432}
433
434int __exit snd_minor_info_done(void)
435{
Takashi Iwai746d4a02006-06-23 14:37:59 +0200436 snd_info_free_entry(snd_minor_info_entry);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700437 return 0;
438}
Takashi Iwaie28563c2005-12-01 10:42:42 +0100439#endif /* CONFIG_PROC_FS */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700440
441/*
442 * INIT PART
443 */
444
445static int __init alsa_sound_init(void)
446{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700447 snd_major = major;
448 snd_ecards_limit = cards_limit;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700449 if (register_chrdev(major, "alsa", &snd_fops)) {
450 snd_printk(KERN_ERR "unable to register native major device number %d\n", major);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700451 return -EIO;
452 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700453 if (snd_info_init() < 0) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700454 unregister_chrdev(major, "alsa");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700455 return -ENOMEM;
456 }
457 snd_info_minor_register();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700458#ifndef MODULE
459 printk(KERN_INFO "Advanced Linux Sound Architecture Driver Version " CONFIG_SND_VERSION CONFIG_SND_DATE ".\n");
460#endif
461 return 0;
462}
463
464static void __exit alsa_sound_exit(void)
465{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700466 snd_info_minor_unregister();
467 snd_info_done();
Akinobu Mita68fc4fa2007-07-19 01:47:50 -0700468 unregister_chrdev(major, "alsa");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700469}
470
Thadeu Lima de Souza Cascardoc181a132010-01-12 20:20:39 -0200471subsys_initcall(alsa_sound_init);
472module_exit(alsa_sound_exit);